Answer:
help me with my new question its science i got like 2 hrs left fr
Explanation:
what is the moment of inertia ia of particle a? what is the moment of inertia of particle a? mr2 9mr2 10mr2 undefined: an axis of rotation has not been specified.
The moment of inertia of a particle is mr²
Moment of inertia is a quantitative measure of the rotational inertia of a body in physics - i.e. The resistance that a body exhibits to changing its rotational speed about its axis by the application of torque (torque). Axes can be internal or external and can be fixed or unfixed.
In general, the moment of inertia of a uniform body is calculated as the product of the square of the distance (r²) from the axis of rotation and its mass. The flywheel is a heavy mass attached to the engine's crankshaft is one example of the moment of inertia
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Sam prepares a solution of sodium chloride with a concentration of 8 g/dm3. If he only used 2 g of sodium chloride, what volume of water did he dissolve it in, in cm3?.
The amount of water for 2 g of sodium chloride with a concentration of [tex]8g/dm^{3}[/tex] is 250[tex]cm^{3}[/tex]
The mass of the solute in relation to the solution has been defined as concentration. There are many other ways to indicate concentration, including density, molarity, molality, etc.
The specified solution has been concentrated. It has been reported that [tex]8g/dm^{3}[/tex] sample were present in a solution with a volume of 1 cubic decimeter.
Quantity of water
For a solution of 2 grams of sodium chloride, the volume of water was calculated as follows:
8 g = 1 [tex]dm^{3}[/tex]
Therefore, 2g = X
X= 2*1/8
X= 0.25 [tex]dm^{3}[/tex]
For 2 g of solution, 0.25 cubic decimeters of water were used.
In cubic centimeters, the decimeter cube has been assigned the following values:
1 [tex]dm^{3}[/tex] = 1000 [tex]cm^{3}[/tex]
0.25 [tex]dm^{3}[/tex] = Y
Y= 0.25*1000/1
Y= 250 [tex]cm^{3}[/tex]
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how does the second law of thermodynamics explain the diffusion of substances? (explain why particles are more likely to move from high to lower concentration using entropy in your answer.)
The second law of thermodynamics explain the diffusion of substances is that trend of randomization. Diffusion of particles of solute from higher concentration to lower concentration lead to increase in entropy.
The second law of thermodynamics explain the trend of randomization or an increasing in entropy. if the concentration of substances on both sides are same then the distribution is random is more than the concentration is unequal. Diffusion of as substance from higher to lower leads to increase in entropy ,. when the concentration decreases entropy increases.
Thus, The second law of thermodynamics explain the diffusion of substances is that trend of randomization. Diffusion of particles of solute from higher concentration to lower concentration lead to increase in entropy.
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if the acceptable range of hardness is (70 - c; 70 c), for what value of c would 95% of all specimens have acceptable hardness?
The acceptable range of hardness is (70 - c; 70 c), then the value of c is 5.88.
What is Normal distribution?The normal distribution, sometimes referred to as the Gaussian distribution, is a probability distribution that is symmetric about the mean and demonstrates that data that are close to the mean are more likely to occur than data that are far from the mean.
P(70-c < X < 70+c) = 0.95
By using z score formula,
On the normal standard distribution, we can identify two values that add up to 0.95 of the values in the middle. In this instance, the two values are:
[tex]z_{crit}[/tex] = ±1.96{tex} < /p><p>
[tex]z_{crit}[/tex] = {tex}P(-1.96 < Z < 1.96)
[tex]z_{crit}[/tex] = 0.95
we have,
-1.96 = [tex]\frac{(71-c)-71}{3}[/tex]
value of c,
-1.96 × 3 = -c, c = 5.88
1.96 = [tex]\frac{(71+c)-71}{3}[/tex]
value of c,
1.96 × 3 =c,c = 5.88
∴The value of c is 5.88.
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At about what temperature does the sample change phase? Justify your answer based on the cooling curve shown on the left.
pleaseeeee can anyone helppp
The kinetic energy in a system is directly proportional to the temperature of a system.
The higher the temperature, the faster the particles of a system will move. From the kinetic molecular theory, we see that the temperature of a system is a measure of the average kinetic energy of the molecules. In chemical kinetics, as the temperature increases, the kinetic energy of the system also increases.
The average air temperature read by a well-exposed thermometer over a specified period of time. For climate tables, average temperatures are usually calculated monthly and yearly.
Kelvin is the SI unit of thermodynamic temperature and one of the seven SI base units. Unusually, SI also defines another temperature unit called Celsius. Degrees Celsius is obtained by subtracting 273.15 from the temperature number in Kelvin.
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relative to the inside of a cell, what is meant when the surrounding solution is describes as being:
The inside of a cell, what is meant when the surrounding solution is is called hypertonic solution.
What is hypertonic solution?
When a cell is immersed in a hypertonic solution, there is a net flow of water out of the cell, resulting in volume loss. A solution is hypertonic to a cell if its solute concentration exceeds that of the cell, and the solutes are unable to penetrate the membrane.
A hypertonic solution is a solution that has a higher concentration of solutes on the exterior of a cell than on the inside of a cell.
A hypertonic solution has a higher osmotic pressure than another solution. In other terms, a hypertonic solution has a higher concentration or quantity of solute particles outside a membrane than inside it.
The traditional example used to describe tonicity is red blood cells. When the concentration of salts (ions) inside the blood cell is the same as the concentration outside, the solution is isotonic with respect to the cells, and they resume their usual form and size.
If there are less solutes outside the cell than inside it, as if red blood cells were placed in fresh water, the solution (water) is hypotonic in comparison to the interior of the red blood cells. As water rushes into the cell to try to equalise the concentrations of the interior and outer solutions, the cells enlarge and may explode.
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a compound with the chemical formula c6h8 reacts with h2/pt to give a product with the formula c6h12. which of the following options correctly interpret these data? select all that apply.
Both react with hydrogen gas in presence of palladium gives a cyclic compound with a molecular formula of C6H12.
Cyclic compound is also referred to as ring compound or structure, in the field of chemistry where two or more atoms of a compound are attached together to form a ring. The ring may vary in size according to the number of atoms present and how branched the compound is.
Some of the examples of ring structure is the benzene ring, phenol and etc. Cyclic compounds show various combinations of stereochemical features, including conformations, stereocenters, chirality, enantiomers, diastereomeric, and another form of cis/trans stereoisomerism.
In the given condition C6H8 reacts with hydrogen gas in presence of palladium and gives rise to a cyclic compound with a formula C6H12.
Complete question: -
provide a possible structure for a compound with formula C6H8, given that it reacts with excess H2/Pt to give C6H12. what is (are) the product(s) in the hydrogenation of your substance? draw the structure(s) for the product(s) as well (including the stereochemistry).
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A mystery white powder is made up of 27% C, 9% H, and 64% F. What is its empirical formula?
Answer: CH 2 0
Explanation:
Compare and contrast a solution that has a ph less than seven, greater than seven and equal to seven.
The solution having PH less than 7 is slightly acidic, PH equals to 7 is considered to be neutral and the one more than 7 is basic.
What is PH and what is the contrast in the PH of the solution have great PH and low PH?PH is the hydrogen ion concentration in the solution determining the acidity and basicity of the solution.Here the question is asked of the solution that has a PH less than seven, greater than seven and equal to seven.So the solution having PH more than 7 is basic , the solution having PH equals to 7 is considered to be neutral and the solution having PH less than 7 is considered to be acidic.When the PH of the solution is 2 or 3 then the solution is considered to be highly acidic.When the PH of the solution is exactly and precisely 7 then the solution is neutral.To know more about PH visit:
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g the compound a-tocopherol, a form of vitamin e (atlas m3), is a powerful antioxidant that may help to maintain the integrity of biological membranes. the light-induced reaction between duroquinone and the antioxidant in ethanol is bimolecular and
According to the given statement The rate constant for the reaction is 3.7×10⁻¹⁰m.
What is a physical reaction?A physical reaction is an action that alters the material or object's physical properties. Examples of physical properties are mass, size, and density. A physical reaction is defined as a response in which ions rearrange one another without experiencing a chemical change.
Briefing:Vitamin E is used in this activity.
A study of the interaction between the oxidant in ethanol and photochemically stimulated duroquinone is available.
Duroquinone was photochemically excited, and a bimolecular reaction followed at a diffusion-limited rate.
(a) In this case, we must calculate the rate constant for an ethanol diffusion-limited process.
We have datas for:
R = 8.314K⁻¹η
T = 298Kmol⁻¹
η = 1.06 x 10-3 kg m-1 s⁻¹
K = 8RT/3η
K = 8 × 8.314 × 298/ 3η
K = 6.23×10⁹dm³mol⁻¹s⁻¹
Here we have to estimate critical reaction distance if the sum of diffusion coefficients is 1×10⁻⁹m²s⁻¹
Firstly we will write equation for kk and from it express and calculate R*
K = 4πR*DNₐ
R* = 2.77×10⁹×10⁻³/4π 1×10⁻⁹×6.23×10²³
R* = 3.7×10⁻¹⁰m.
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How do you know if a new substance is formed in a chemical equation?
The indication written identify the new substance is formed in a chemical reaction.
A chemical reaction happens when substances break down or combine to form a one or more new substances. the substance take part in a chemical reaction initially called as reactants and the substance forms at the end of the chemical reaction is called as products.
The sign or indications of new substance is formed are:
formation of ppt change in colorevolution of gasformation of bubbleschange in properties change in odorThe phase change is not consider as the chemical change.
Thus, The indication written identify the new substance is formed in a chemical reaction.
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How does the law of conservation of mass tell you that reacting zinc with hydrochloric acid can never produce aluminum oxide?
The law of conservation of mass explains clearly to me that a reaction between zinc and hydrochloric acid can never produce aluminum oxide as the product formed was not part of the reaction.
What is it meant by the law of conservation of mass?The law of conservation of mass or matter state matter is neither created not destroyed but changes from one form to another. Applying this to the task above, when zinc combine with hydrochloric acid, it forms zinc chloride and librate hydrogen gas.
The chemical equation is given below:
Zn (s)+2HCl(aq) → ZnCl₂(g) H₂O
So therefore, we can confirm that matter can neither be created not destroyed in a chemical reaction.
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Which factor does not influence whether a substance will be a liquid at room temperature and normal atmospheric pressure?
Surface tension does not influence whether a substance will be a liquid at room temperature and normal atmospheric pressure.
What is Surface tension?Surface tension is the propensity for liquid surfaces that are at rest to condense into the smallest surface area. Razor blades and insects, which have a density greater than that of water, can float on the surface of the water without even becoming partially buried because to surface tension. Cohesive interactions between the liquid's molecule's cause the surface tension to develop. The molecules at the center of the liquid are surrounded by other molecules on both sides. Because molecules are pulling against one another equally in all directions, there is no net force.The two are equivalent, but when discussing energy per unit of area, surface energy is frequently used because it is a more inclusive term that includes solids. Surface tension can represent either surface stress or surface energy in materials science.To learn more about Surface tension refer to:
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an unknown compound that is insoluble in water, but dissolves in a solution of sodium carbonate and produces bubbles is almost certainly a .
Carboxylic acid is that compound.
What is Carboxylic acid?
Carboxylic acids are the most important functional group in C=O. This type of organic chemical can be formed through several processes; for example, some carboxylic acids, such as citric acid, lactic acid, or fumaric acid, are produced through fermentation; the majority of these carboxylic acids are used in the food sector.
A carboxylic acid has the generic formula R-COOH, where COOH refers to the carboxyl group and R refers to the rest of the molecule to which this group is linked. There is a carbon in this carboxyl group that has a double connection with an oxygen atom and a single bond with a hydroxyl group.
When combined with metal carbonates, carboxylic acid produces salt. For example, when acetic acid reacts with sodium carbonate, the results are sodium acetate, carbon dioxide, and water. The salt generated will be the same as that formed when acetic acid reacts with a simple metal.
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if 4.6 g of cu3(po4)2(s) was recovered from step 1, what was the approximate [cu2 ] in the original solution? (the molar mass of cu3(po4)2 is 381 g/mol.)
The following is the product of the given reaction and the balanced form: 2FePO4 + 3Cu(OH)2 = Cu3(PO4)2 + 2Fe(OH)3 (option C).
How can a chemical reaction be balanced?
A chemical reaction occurs when two or more reactants combine to produce products.To balance the reaction, the number of moles of each element on both sides of the equation must be equal. The following reaction is given in response to this question: Cu3(PO4)2 + Fe(OH)3?
Cu3(PO4)2 + 2Fe(OH)3 2FePO4 + 3Cu(OH)2 is the product of the given reaction and the balanced form.
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You measure the mass and volume of a sample of metal and record the values. You double the mass of the sample and find the new volume of this larger sample. How would the new volume compare to the original volume?.
Mass divided by volume equals density (D = m/v). The increased volume is double what the old volume was.
How do you calculate the metal sample's volume?The displacement method can be used to determine the volume of an oddly formed metal. Measure the amount of water in a beaker after filling it halfway. Record the new amount of water after inserting the metal into the liquid. To calculate the volume of the metal, deduct the final volume from the original volume of water.
If you have a larger portion of a material, what happens to its density?A material's density reduces as it expands because it takes up more space. All types of matter experience this phenomenon.
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Potassium hydrogen phthalate, khp, is used as a primary standard for determining the concentration of a solution of naoh by titration. If the khp has not been dried before weighing, the calculated molarity of the naoh would be.
If the KHP was not dried before weighing, the calculated NaOH molarity would be higher than the actual value because the apparent mass of KHP includes water.
What is KHP ?KHP is potassium hydrogen phthalate. Stable in air and easy to weigh, it is commonly used as a primary standard in pure form for sodium hydroxide titration.However, if the KHP is not dry enough, the calculated KHP molarity will be higher than the actual value because the mass of water is included as part of the KHP mass.Again, the molar ratio of reaction between KHP and NaOH is 1:1. Therefore, if the molar concentration of KHP is higher than the actual value, the molar concentration of NaOH is also higher than the actual value.To know more about potassium hydrogen phthalate visit:
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When preparing a solution in a cuvette, make sure to handle the cuvette by the_____________ and avoid touching the __________ then, __________- the cuvette before placing it in the spectrophotometer.
When preparing a solution in a cuvette, make sure to handle the cuvette by the textured sides,and avoid touching the smooth sides, then, wipe down the cuvette before placing it in the spectrophotometer.
A cuvette is a little tube-shaped container with round or square cross section and straight sides. It is formed of a clear, transparent substance like plastic, glass, or fused quartz and is sealed at one end.
A spectrophotometer is a device that counts the number of photons (light's energy) absorbed after they have passed through a sample solution. By measuring the intensity of light detected, the spectrophotometer may also estimate the quantities of a known chemical compound.
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When preparing a solution in a cuvette, make sure to handle the cuvette by the textured sides,and avoid touching the smooth sides, then, wipe down the cuvette before placing it in the spectrophotometer.
A cuvette is a little tube-shaped container with straight edges and a round or square cross section. It is made of a clear, translucent material with a sealed end, such as plastic, glass, or fused quartz.
A spectrophotometer measures the quantity of photons—the energy of light—that are absorbed after passing through a sample solution. The spectrophotometer can also estimate the amounts of a known chemical substance by measuring the intensity of light that is observed.
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which of the following compounds forms a racemic mixture of an optically active product when it is hydrogenated? a) i b) ii c) iii d) iv e) v
The compound that forms a racemic mixture of an optically active product when it is hydrogenated is 2-butanol.
What is optically active in a racemic mixture?
A chiral molecule is one that has two enantiomers, or nonsuperimposable mirror images of one another. An equal mixture of each of the two enantiomers of a particular chiral molecule is referred to as a racemic mixture. A racemic combination has the intriguing property of being optically inactive, which means it does not rotate plane polarized light. Actually, to be more precise, it rotates light, but it does so by an equal amount in both directions, so the net rotation is zero.To learn more about racemic mixture, follow the link https://brainly.com/question/27835707
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which of the following compounds is a meso compound? multiple choice (2r, 3s)-2,3-dichlorobutane (2r, 3r)-2,3-dichlorobutane (2r, 3s)-3-chloro-2-butanol (2r, 3r)-3-chloro-2-butanol
(2R,3S), 2,3-dibromobutane (2R,3R), 2,3-dibromobutane Superposition of mirror images is not feasible yet stereoisomers can arise.
A superimposable mirror image can be created using (2R,4S)-2,4Dibromopentane.
Non-superimposable mirror-image versions of the 2,4 dibromopentane ring (2R,4R).
What do you understand by Stereoisomerism?Stereoisomerism, also known as spatial isomerism, is a type of isomerism used in stereochemistry in which molecules with identical chemical structures and order of linked atoms (constitution) change in the three-dimensional spatial orientations of their atoms. In contrast, structural isomers have the same chemical formula but have different bond arrangements or bond orders. Stereoisomers of one another's molecules, by definition, represent the same structural isomer.
What is a configurational stereoisomer?A stereoisomer of a reference molecule that has the opposite configuration at a stereocenter is known as a configurational stereoisomer (e.g., R- vs S- or E- vs Z-). This indicates that only disrupting covalent bonds to the stereocenter, for as by inverting the configurations of some or all of the stereocenters in a compound, will allow configurational isomers to be interconverted.
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Type the correct answer in each box. what is the oxidation state of each element in the compound caso4? include or - in your answers as appropriate. the oxidation state of calcium is . the oxidation state of sulfur is . the oxidation state of oxygen is .
The oxidation state of Ca in CaSO₄ is +2. The charge of the whole group SO₄ is -2. The charge of S is +6 and that of O is -2.
What is oxidation state?The oxidation state of a species is the numerical charge it possess. Thus, it is the number of electrons the element lost or gained. The total charge of a compound will be zero and every compound tends to exist as neutral.
The total charge of the compound CaSO₄ is zero and that of SO₄ is -2. Hence, to neutralize that Ca lose 2 electrons and form in +2 oxidation state.
The charge of one oxygen is -2. Here we have 4 oxygens and the total charge of all oxygens is -8 in the group SO₄.
Now, the charge of S = (-2) - (-8) = +6. Hence, the oxidation state of sulphur is +6.
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Can someone please help me with question 4&5 please
The pH of the solution is obtained is basic pH, hence the solution is a base and it will change the color of Bromocresol from yellow to blue. Phenolphthalein is colorless in neutral and acidic solution but it gives basic pink color in basic solution.
What is pH?pH of a solution is the measure of the H+ ion concentration. Mathematically it is negative logarithm of H+ ion or hydronium ion concentration. It measures how acidic or basic the solution is.
The pH of the solution is obtained as 12.2 and hence the solution is basic since pH above 7 is basic solutions. Bromocresol blue shows the color change from yellow to blue in the pH range of 3 - 5.4. Hence above a pH of 5.4 it shows blue color.
Phenolphthalein shows a color change from 8 - 9.5 pH range from colorless to pink. Hence, it gives pink color for the given solution.
Let AOH be the solution and when it dissociates in water it gives OH- ions as per the Arrhenius theory. Based on this theory we cannot say that it is monoprotic or diprotic ,however it flourish all the OH- ions to water.
[tex]\rm AOH \rightarrow A^{+} +OH^{-}[/tex]
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Ionic formula for :
strontium chloride
caesium selenide
calcium astatide
radium polonide
gallium fluoride
scandium(III) bromide
chromium(III) oxide
strontium iodide
lithium arsenide
Aluminium nitrate
Silver nitrate
Calcium hydrocarbonate
Magnesium nitrate
Ionic formula for :
SrCl₂ Cs₂Se CaAt₂ RaPo GaF₃ ScBr₃ Cr₂O₃ SrI₂ Li₃As Al(NO₃)₃1) strontium chloride : it is an ionic compound .
formula : SrCl₂
2) cesium selenide :
formula : Cs₂Se
3) calcium astatine:
ionic formula : CaAt₂
4) radium polonide :
formula : RaPo
5) gallium fluoride :
ionic formula : GaF₃
6) scandium(III) bromide :
formula : ScBr₃
7) chromium(III) oxide :
formula : Cr₂O₃
8) strontium iodide:
formula : SrI₂
9) lithium arsenide :
formula : Li₃As
10) Aluminum nitrate :
formula : Al(NO₃)₃
Thus, the ionic formula for the following compounds are , Ionic formula for :
SrCl₂ Cs₂Se CaAt₂ RaPo GaF₃ ScBr₃ Cr₂O₃ SrI₂ Li₃As Al(NO₃)₃To learn more about ionic formula here
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According to the Heisenberg Uncertainty Principle, which of the following statements is inaccurate?
A. A certain electron has a speed of 1.6 x 10 m/s.
B. A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s.
C. A certain electron is located in the 2p orbital of its atom.
Answer: B
Explanation:
According to the Heisenberg Uncertainty Principle, the statement that is inaccurate is A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s. The correct option is B.
What is Heisenberg's Uncertainty Principle?The uncertainty principle, commonly known as Heisenberg's uncertainty principle, refers to any of a number of mathematical inequalities that state a basic cap on how precisely specific pairings of a particle's physical properties, known as complementary variables, may be predicted.
According to the Heisenberg uncertainty principle, it is impossible to simultaneously estimate with high precision an electron's momentum and position.
Therefore, the correct option is B. A certain electron located in the 3d ¹0 orbital has a speed of 1.6 x 106 m/s.
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Help me with this answer please
Option D. The result of a chemical change is a different chemical composition, In a physical change the chemical composition remain the same.
A chemical change happens when one chemical substance is transformed into one or more special materials, which includes when iron will become rust. Chemical changes occur thru the system of chemical reactions, and the resulting materials have extraordinary houses because their atoms and molecules are arranged in a different ways.
Physical changes are adjustments affecting the shape of a chemical substance, but not its chemical composition. physical modifications are used to split combos into their factor compounds, however, can not generally be used to separate compounds into chemical factors or less difficult compounds
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The answer is the result of a chemical change is different chemical composition, in physical change the chemical composition remains the same.
Physical change is a temporary change. A chemical change is a permanent change. A physical change impacts simplest bodily residences i.e. shape, size, etc. Chemical change each physical and chemical residences of the substance including its composition. A bodily change entails very little to no absorption of electricity.
A chemical change is a trade of materials into another, new materials with distinctive properties and one or a couple of new materials are fashioned. It outcomes when a substance combines with another to form a new substance.
Changes in the length or shape of count are examples of physical change. Physical changes include transitions from one nation to every other, consisting of from strong to liquid or liquid to gasoline. Cutting, bending, dissolving, freezing, boiling, and melting are a number of the tactics that create physical adjustments.
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An oxide of copper was reduced to copper metal by reaction with hydrogen. copper oxide + hydrogen → copper + water Use the data in the table to find the empirical formula of this oxide of copper.
The empirical formula of the oxide is Cu₂O
How do I determine empirical formula?We'll begin obtaining the mass of the oxide, copper and oxygen. This is shown below:
Mass of ontainer = 25.61 g Mass of container + copper oxide = 26.97 gMass of oxide =?Mass of oxide = (Mass of container + copper oxide) - (Mass of container
Mass of oxide = 26.97 - 25.61
Mass of oxide = 1.36 g
Mass of ontainer = 25.61 g Mass of container + copper = 26.82 gMass of copper =?Mass of copper = (Mass of container + copper) - (Mass of container)
Mass of copper = 26.82 - 25.61
Mass of copper = 1.21 g
Mass of oxide = 1.36 gMass of copper = 1.21 gMass of oxygen =?Mass of oxygen = (Mass of oxide) - (Mass of copper)
Mass of oxygen = 1.36 - 1.21
Mass of oxygen = 0.15 g
Finally, we shall determine the empirical formula of the oxide. Details below
Mass of copper (Cu) = 1.21 gMass of oxygen (O) = 0.15 gEmpirical formula =?Divide by their molar mass
Cu = 1.21 / 63.55 = 0.0190
O = 0.15 / 16 = 0.009375
Divide by the smallest
Cu = 0.0190 / 0.009375 = 2
O = 0.009375 / 0.009375 = 1
Thus, the empirical formula of the oxide is Cu₂O
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Complete question:
An oxide of copper was reduced to form copper metal by reaction with hydrogen. Use the data in the table to find the empirical formula of this oxide of copper.
Table reads as follows:
Container – 25.61g
Container + copper oxide (before reaction) – 26.97g,
Container + copper (after reaction) – 26.82g.
The energy diagram is for the decomposition of hydrogen fluoride into hydrogen & fluorine
gases.
(a) Write the balanced equation.
(b) Explain what is shown by arrow
(c) Draw the transition state.
(d) Is this exothermic or endothermic? Explain.
a) H₂ + F₂ → 2HF is the balanced equation.
b) Conversion of hydrogen and fluorine to hydrogen fluoride
c) 3 HF ⇌ H₂F + + HF⁻².
d) ΣΔH°f(reactants) > ΣΔH°f(products), so H₂ + F₂ → HF is exothermic.
What is a balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction.In other words, both sides of the reaction have an equal balance of mass and charge.It is typical to balance chemical equations for both mass and charge in aqueous solutions.Equal numbers and types of atoms are produced on both sides of the equation when balancing for mass.When the charge is balanced, there is no net charge on either side of the equation.Only the ions are shown in the equation and they are in water because the state of matter (aq) stands for aqueous.a) H₂ + F₂ → 2HF is the balanced equation.
b) Conversion of hydrogen and fluorine to hydrogen fluoride
c) 3 HF ⇌ H₂F + + HF⁻².
d) ΣΔH°f(reactants) > ΣΔH°f(products), so H₂ + F₂ → HF is exothermic.
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What’s the answer for this question in chemistry
Answer:
All Alkali metals form +1 cations
Noble gases do not form ions
Halogens form -1 anions
Alkaline Earth metals form +2 cations
chalcogens forms -2 anions
If 50. Ml of 1. 0 m naoh is diluted with distilled water to a volume of 2. 0 l, the concentration of the resulting solution is.
The concentration of the resulting solution is 0.025 M.
What is molar concentration?Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution. The most commonly used unit of molarity in chemistry is moles per liter in SI units using the unit symbols mol/L or mol/dm³.
For the given case,
Concentration of NaOH (M₁) = 1 M
Volume of NaOH (V₁) = 50 ml or 0.05 L
Concentration of solution (M₂) = ?
Volume of solution (V₂) = 2 L
Since, M₁V₁ = M₂V₂
1 × 0.05 = M₂ × 2
M₂ = 0.025 M
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A mixture of 40. 0 g of oxygen and 40. 0g of helium has a total pressure of 0. 900 atm. What is the partial pressure of oxygen?.
Partial pressure of O₂ = 0.045 atm
Partial pressure of He = 0.396 atm
What exactly does partial pressure mean?According to the definition of partial pressure, each gas that is present in a container full of gases presses against the other gases. Its partial pressure refers to any gas's pressure inside the container.
Mass of O₂ = 40.0 g
Mass of He = 40.0 g
Total pressure = 0.900 atm
Partial pressure of each gas = ?
We will first determine the number of moles.
Number of moles of O₂:
Number of moles = mass/molar mass
Number of moles = 40.0 g/ 32 g/mol
Number of moles = 1.25 mol
Number of moles of He:
Number of moles = mass/molar mass
Number of moles = 40.0 g/ 4 g/mol
Number of moles = 10 mol
Total number of moles = 10 mol + 1.25 mol = 12.5 mol
Mole fraction of O₂ = 1.25 mol/ 22.5 mol = 0.05
Mole fraction of He = 10 mol / 22.5 mol = 0.44
Partial pressure:
Partial pressure of O₂ = 0.05× 0.900 atm = 0.045 atm
Partial pressure of He = 0.44 × 0.900 atm = 0.396 atm
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